feat(logging): add --log arg to enable logs

and/or to pass a custom log directory.

src/main.rs

@@ -3,7 +3,6 @@ mod common;
 mod config;
 mod constants;
 mod events;
-#[cfg(debug_assertions)]
 mod logging;
 
 mod args;
@@ -17,21 +16,44 @@ mod widgets;
 mod sound;
 
 use app::{App, FromAppArgs};
-use args::Args;
+use args::{Args, LOG_DIRECTORY_DEFAULT_MISSING_VALUE};
 use clap::Parser;
 use color_eyre::Result;
 use config::Config;
+use std::path::PathBuf;
 use storage::{AppStorage, Storage};
 
 #[tokio::main]
 async fn main() -> Result<()> {
+    // init `Config`
     let cfg = Config::init()?;
-    #[cfg(debug_assertions)]
-    logging::Logger::new(cfg.log_dir).init()?;
 
     color_eyre::install()?;
+
     // get args given by CLI
     let args = Args::parse();
+    // Note:
+    // `log` arg can have three different values:
+    // (1) not set => None
+    // (2) set with path => Some(Some(path))
+    // (3) set without path => Some(None)
+    let custom_log_dir: Option<Option<&PathBuf>> = if let Some(path) = &args.log {
+        if path.ne(PathBuf::from(LOG_DIRECTORY_DEFAULT_MISSING_VALUE).as_os_str()) {
+            // (2)
+            Some(Some(path))
+        } else {
+            // (3)
+            Some(None)
+        }
+    } else {
+        // (1)
+        None
+    };
+
+    if let Some(log_dir) = custom_log_dir {
+        let dir: PathBuf = log_dir.unwrap_or(&cfg.log_dir).to_path_buf();
+        logging::Logger::new(dir).init()?;
+    }
 
     let mut terminal = terminal::setup()?;
     let events = events::Events::new();